12.5 Cycle 17 Calibration Program

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The Cycle 17 calibration program continued the testing begun during SMOV. It included long-term programs to monitor the sensitivity and wavelength scale of both the NUV and FUV detectors. Midway through Cycle 17, additional calibration programs were added. Brief descriptions of these monitoring programs are presented in Table 12.2. Table 12.4 lists additional special calibration programs that were undertaken in Cycle 17. A comprehensive review of the Cycle 17 calibration program was published in COS ISR 2012-02 (Osten et al. 2012).


Table 12.4: Cycle 17 Calibration Program.

Program IDTitleAccuracy AchievedProducts

12010

COS FUV Line Spread Function Characterization

Continuum S/N = 9.2 near 1530 Å

COS ISR 2009-01,
Tables of LSF models

12052

COS NUV Grating Efficiency Test

Few percent uncertainty in count-rate ratios

Calibration Workshop paper, ISR

12080

G140L Focus Sweep

30% uncertainty in autocorrelation FWHM of spectra

ISR

12081

COS Flux Calibration Below 1150 Å with G140L/1280

3% for 900–1150 Å,
10% for 300–700 Å

ISR, Reference file

12082

Extending COS/ G130M Coverage Down to 905 Å with Two New Central Wavelengths

wavelength scale: ±0.5 Å,
sensitivity: ±5–10%,
resolution: 20–30%

ISR, Reference file

12083

G140L/1280 Wavecal Template

N/A

Reference file

12084

G140L/1280 Internal-to-External Wavelength Scales

7.5–12.5 pixel wavelength zero-point accuracy

Reference file

12085

STIS/E230M Data to Determine Internal-to-External Offsets in COS/G230L

Not evaluated yet

Reference file

12086

Generation of 1-D Fixed-Pattern Templates

2%

Reference file, ISR

12096

COS FUV Detector Lifetime Position Test

min S/N per resel of 30 at λcen

ISR

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